Fan



March 8, 1938. COHEN 2,110,621

,FAN

Filed Feb. 8, 1955 INVENTOR.

Trad/g0?! Co/ze/z A TTORNE Y.

Patented Mar. 8,

UNITED STATES "PATENT OFFICE mal Units Manufacturing Company,

Chicago,

11]., a corporation of Illinois Application February 8, 1935, Serial No.5,518

10 Claims.

The invention relates to fans and more specifically to fans for heatingair that is to be circulated.

The principal object of the invention is to provide a fan with heatingelements and means to facilitate the rapid transfer of heat from suchelements.

A further object of the invention is to provide fan blades with fins toaid the transfer of heat from heating elements secured thereon.

A further object of the invention is to provide a fan with heatingelements and additional heat transferring surface without lowering thechiciency of the fan.

Other objects and advantages of the invention will be more apparent fromthe following description, wherein reference is made to the accompanyingsingle sheet of drawing, hereby made a part of this specification, andupon which- Figure 1 is a side elevation of a motor driven fan, partlyin section, embodying one form of the invention;

Figure 2 is'a front elevation of the fan blade member shown in Figure 1detached from the motor;

Figure 3 is a section, partly broken away, on line 3-3 of Figure 2showing one form of a radiating fin which may be used upon the fan;

Figure 4 is a similar view of a second form of a radiating fin; and

Figure 5 is a transverse section across a cast blade which may besubstituted for the fabricated blade illustrated in the precedingfigures.

By way of illustration of the invention, there is shown in Figure lasuitable pedestal or base 5 supporting a motor casing 6. A motor of aconventional type contained within the casing 8 propels a motor shaft 1.

Attached to the end of the shaft 1, by means of a suitable clampingscrew 8, or otherwise suitably secured thereto, is a fan bladesupporting hub 9. Integral with the hub 9 (or if preferred, attachedthereto) are fan blades in curved outwardly along one edge to form animpelling lip ll. Integral with or attached to, as preferred, andprotruding forwardly from the face of the blades iii are radiating finsl2 arranged concentrically with respect to the propelling shaft I.

While there is illustrated two diametrically opposed blades i0,radiating fins l2, and supporting hub 9, all cast as an integral member,it will be apparent that the agitating or circulating unit may beconstructed in other manners. The blades I. may be of any suitabledifferent configuration, pitch or number. The blades illustrated are ofa popular type. The radiating fins likewise may be of any desiredconfiguration or number. Those shown, four on each blade, are of astreamlined type as moreclearly illustrated 5 in Figure 3. Thecontinuous width type shown in Figure 4 may be used with equal facility.

Secured in a suitable manner upon the backs of blades III aretransversely spaced members i3 of complementary configuration to fanblades H1, 10 arranged to form with said blades a space wherein heatingelements are disposed and enclosed. Integral with transverse members l3are radiating fins I 4 of a shape and arrangement similar to fins H onblade I0. Fins i4 may be in alignment with fins I 2 at the opposite sideof the circulating member. The purpose and utility of the fins will behereinafter described.

The heating means shown in Figure 2 and-the motor shown in Figure 1 havea common source of electrical supply IS. The conduit l 5 branches toenergize the motor through conduit 16 and to energize the heatingelements through conduit ll. Conduit IT has therein a switch l8.

When the switch i8 is closed, current passes through conduit I'I intocontacting brushes IQ of the usual type. Brushes i9 maintain a constantelectrical contact with contact rings 20. From these rings, currentpasses into conduits 2i and into the heating elements 22 which may be ofthe common resistance type, generally used in electric flat irons. Theheating element shown is of a horseshoe form, but it is obvious that anyother desired shape may be used. Other means for establishing a circuitto the heating elements may be substituted for the arrangement shown.

The heating elements 22 are in the space between fan blades 10 andmembers l3. Such elements are electrically insulated from the blades l0and members 13 by an insulating paste or in any other manner whichallows heat conductivity from the elements 22 to the bodies of theblades Ill and members l3. Such heat travels by conductivity through theblades i0 and members l3 and into the fins l2 and i4 and is radiatedfrom the blades, the members, and the fins on such blades and members.

Heretofore it has been the practice to rely entirely upon the surface ofthe fan blades to radiate heat from the source of heat supply inassociation therewith. In the present device, transmission of heat toair is facilitated by adding radiating fins at the front and at the backof the blades. Such fins are so arrangedthat they describe a circularpath when rotating. 5g

The fan blades pick up such heated air and add to such heated air theair heated by the blades themselves. The blades force such heatedparently is to increase the air circulation and to drive the air in amore definite course. Generally the fins have the sides of theirelongated fiat bodies concentric with the axis of rotation of the motorand the fan blades, but eccentricity of the fins may be substituted whendesired. Ordinarily such eccentricity is slight and does not seriouslyreduce the speed of the fan.

In Figure 5, a blade is illustrated which com prises a heating element22a encased in insulation 221) and about which the blade body la iscast. Fins l2a and Ma are integralwith the body lila. This structure forthe fan may be substituted for that heretofore described and iseffective for all practical purposes.

. One embodiment of the invention only is described. It will be apparentthat many and various other forms of construction may be employed toproduce a larger radiating surface. There is no desire to limit theinvention to the disclosed form thereof for it is contemplated that manychanges or modifications may be made without departing from the spiritof the invention.

What is claimed as new and is desired to be secured by Letters Patent ofthe United States is:

1. In an air circulating fan, a blade having heating means and formedwith an air propelling surface, and fins on said blade having elongatedbodies arranged transversely of the air propelling surface of saidblade.

2. In an air circulating fan, a blade having an air propelling surfaceand rotatable about an axis, and fins on said blade having elongatedbodies concentric with such axis and transverse of the air propellingsurface of said blade.

3. An air circulating fan comprising a blade of heat conductivematerial, a heating element electrically insulated from and heatconductively attached to said blade, and fins materially increasing theheat transferring surface of said blade in heat conductive relationshipwith said blade.

4. An air circulating fan comprising a blade of heat conductive materialhaving an air impelling surface, a heating element electricallyinsulated from and heat .conductively connected to said blade, and finsmaterially increasing the heat radiating area of said blade in heatconducting relationship therewith and arranged transversely of the airimpelling surface thereof.

5. An air circulating fan comprising a blade of heat conductive materialhaving an air impelling surface and rotatable about an axis, a heatingelement electrically insulated from and heat conductively connected tosaid blade, and fins with elongated bodies concentric with such axismaterially increasing the heat radiating area of said blade in heatconductingreiationship therewith and arranged transversely of the airimpelling surface thereof.

6. A blade for a fan comprising a heating element, an electricalinsulating sheathing over said element, said sheathing being heatconductive, and a blade body of cast material over said sheathing inphysical contact therewith and having heat transferring integral fins atopposite sides thereof.

7. A fan having a hub and blades extending generally radially therefromand which blades are formed to provide air-propelling surfaces, heatingmeans imbedded within and in heatconducting relationship to said bladesbeneath said surfaces, and fins arranged transversely of the blades tothe air propelled by said surfaces.

8. A fan having a hub and blades extending generally radially therefromand which blades are formed to provide air-propelling surfaces, heatingmeans imbedded within and in heatconducting relationship to said bladesbeneath said blades and arranged to transmit heat from the blades to theair propelled by said surfaces, said fins being on arcs of circleshaving their common centerat the axis of rotation of said hub.

9. A fan having a hub and blades extending generally radially therefromand which blades are formed to provide air-propelling surfaces, heatingmeans in heat-conducting relationship to said blades beneath saidsurfaces, and fins arranged transversely of said blades and arranged totransmit heat from the blades to the air pro pelled by said surfaces.

10. A fan having a hub and blades extending generally radially therefromand which blades are formed to provide air-propelling surfaces, heatingmeans in heat-conducting relationship to said blades beneath saidsurfaces, and fins arranged transversely of said blades and arranged totransmit heat from the blades to the air propelled by said surfaces.said fins being on arcs of circles having their common center at theaxis of rotation of said hub.

IRVING H. COHEN.

said blades and arranged to transmit heat from said surfaces, and finsarranged transversely of

